Appendix A Platform-specific features

Whenever a backend doesn’t support one of CFFI’s features, a
specific symbol is pushed onto common-lisp:*features*. The
meanings of these symbols follow.

cffi-sys::flat-namespace

This Lisp has a flat namespace for foreign symbols meaning that you
won’t be able to load two different libraries with homograph functions
and successfully differentiate them through the :library
option to defcfun, defcvar, etc…

cffi-sys::no-foreign-funcall

The macro foreign-funcall is not available. On such
platforms, the only way to call a foreign function is through
defcfun. See foreign-funcall, and defcfun.

32-bit Lispworks 5.0+ is an exception. In addition to the CFFI
implementation described above, Lispworks itself implements the
long long type for Functions. Callbacks are still
missing long long support, though.

cffi-sys::no-stdcall

This Lisp doesn’t support the stdcall calling convention. Note
that it only makes sense to support stdcall on (32-bit) x86
platforms.